Java tutorial
/* * This file is part of ConfigHub. * * ConfigHub is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * ConfigHub is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with ConfigHub.If not, see <http://www.gnu.org/licenses/>. */ package com.confighub.core.store.diff; import com.confighub.core.repository.AbsoluteFilePath; import com.confighub.core.store.APersisted; import com.confighub.core.utils.Utils; import com.google.gson.JsonObject; import javax.persistence.*; /** * */ public class AbsoluteFilePathDiffTracker extends ADiffTracker { @PreRemove public void preRemove(APersisted obj) { obj.revType = APersisted.RevisionType.Delete; } @PrePersist public void prePersist(APersisted obj) { obj.revType = APersisted.RevisionType.Add; } @PostPersist public void postPersist(APersisted obj) { } @PostLoad public void loadOldData(APersisted obj) { if (!isTracked() || !(obj instanceof AbsoluteFilePath)) return; AbsoluteFilePath absoluteFilePath = (AbsoluteFilePath) obj; OriginalAbsFilePath o = new OriginalAbsFilePath(); o.absFilePath = absoluteFilePath.getAbsPath(); obj.revType = APersisted.RevisionType.Modify; edits.get().put(obj.getId(), o); } @PreUpdate public void preUpdate(APersisted obj) { OriginalAbsFilePath o = (OriginalAbsFilePath) getIfRecorded(obj); if (null == o || !(obj instanceof AbsoluteFilePath)) return; JsonObject json = new JsonObject(); AbsoluteFilePath absoluteFilePath = (AbsoluteFilePath) obj; if (!Utils.equal(o.absFilePath, absoluteFilePath.getAbsPath())) json.addProperty("absPath", o.absFilePath); absoluteFilePath.diffJson = json.toString(); } private static class OriginalAbsFilePath extends OriginalAPersistent { String absFilePath; } }